#content{
    padding: 0;
    margin: 0;
    font-size: 18px;
    line-height: 35px;
    border: #5cbbd5 1px solid;
    width: 640px;
    overflow: hidden;
}
ul,li{
    padding: 0;
    margin: 0;
    list-style: none;
}

ul{
    position: relative;
}

.tipText,.tipBg{
    position: absolute;
    width: 640px;
    height: 35px;
    top: 370px;
    /*text-align: center;*/
    text-indent: 8em;
    color: white;
}
.tipBg{
    background: black;
    /*opacity: 背景透明度*/
    opacity: 0.5;
    filter: opacity(0.5);
}